Maybe I can help. The lable of that wool / yarn surely gives SOME information, doesn't it?
German products usually have meters per 50 g labled and have the swatch numbers for stitches and rows on a 10 by 10 cm square...
just handmade stuff may not have any of this info.
But if you know the name and / or the maker of that wool / yarn... I will ask my aunt Google to take a look at it. Since I am German I may find stuff that you can not read much of
Can you scan or photograph the lable, maybe? Or at least give brand and type?
With NO information it is hard to give advice on projects.... but a scarf should always work with 150 g.
Edit: just saw: no lables... make a swatch, pull out the needle, weigh it. Then you know how much that much knitting weighs. Is that any idea for you?